Demand that the sorcerer keep his promise

You stalk toward the twisted old man, your hands clenched into fists. "Are you going to make Val big, like he asked you to? Like you promised you would?"

"No," the sorcerer says. "It would be a **** sentence."

You stop. "How? What do you mean?"

"All over this world, dragons are being hunted to extinction," the sorcerer says. He raises his hands into the air, his fingers glowing with a magical green light as he makes strange symbols in the air. The light expands into a blue, green, and white sphere, hanging in the air between you. Scattered across the slowly rotating surface are a myriad of bright, twinkling lights.

"This is our planet as it was a hundred years ago, and these are the dragons that lived at that time." He waves his hand, and most of the lights flicker and go out. "This is our world today."

"So few," you whisper, looking at each of the dozen or so remaining lights, so far apart from each other. "What happened? Who would do this?"

"Humans," he says sadly. He waves his hand, like brushing away an insect, and the globe vanishes. "Trophy hunters, some, but mostly it was conflicts with the expanding human population. As humans spread out, exploring and settling, grasslands became farmlands, forests became lumber, and mountains became mines. There are few wild places left for dragons, untouched by humans, and any time humans and dragons come into conflict, the dragons always lose."

"Isn't there something you can do?" you ask.

"I'm trying," he says, and he suddenly looks tired. "My colleagues and I have been working for decades to try and save the dragons. We tried creating a sanctuary for them, but large beasts need large territories and large amounts of food, and no place in this world will be safe from humans for much longer. We tried opening a rift into a parallel universe, trying to find a world to relocate them to, but finding a world that will support life, that doesn't already have life, is like finding a needle in a haystack."

"Can't you just protect them?" you ask. "Make them harder to kill or something?"

"Have you any idea how hard it is to kill a dragon now?" he asks. "They have armored scales, and breathe fire, and fly. And even so, humans have invented weapons that can do it. Do you really want to encourage people to try harder to make better weapons? Sorry, but all that would do is **** another arms race, and humans need no help coming up with new ways to destroy things."

"So that's it, then," you say, looking back into the field, at the place where the cavern entrance once stood. "Your solution is to keep him here, until he's the last dragon in the world."

"Not quite," the sorcerer says, stepping toward you. "Dragons as we know them have no place in this world. It is a sad fact, but one that we cannot change. What we can change, is the dragons. But I need your help. He needs your help."

"What do I have to do?" you ask.

"Would you give up your life to save him?"